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21597 (1998 WA8)
Classification: Main-belt Asteroid          SPK-ID: 2021597
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07275400137376739 7.0279e-08  
a 3.021936909907067 3.664e-08 au
q 2.80207890781225 2.0391e-07 au
i 11.25053968376293 8.9363e-06 deg
node 60.02945090782752 3.8124e-05 deg
peri 231.6374384094813 7.9932e-05 deg
M 218.0505661221714 7.1834e-05 deg
tp 2458157.084919728589
(2018-Feb-07.58491973)
0.00038413 JED
period 1918.785892000899
5.25
3.4897e-05
9.554e-08
d
yr
n .187618640256206 3.4122e-09 deg/d
Q 3.241794912001884 3.9306e-08 au
  Orbit Determination Parameters
   # obs. used (total)      901  
   data-arc span      7154 days (19.59 yr)  
   first obs. used      1996-05-16  
   last obs. used      2015-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50271  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:48:17  

Additional Information
 Earth MOID = 1.80029 au 
 Jupiter MOID = 1.87549 au 
 T_jup = 3.213 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2 mag n/a MPO266069  

21597 (1998 WA8)          Discovered 1998-Nov-18 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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